Improved glucose tolerance in rats treated with oxazolidinediones
作者:Rodney C. Schnur、Malcolm Morville
DOI:10.1021/jm00155a030
日期:1986.5
5-(2-Chloro-6-methoxyphenyl)oxazolidine-2,4-dione (49) is the most potent agent selected from a series of 5-substituted oxazolidinediones that were found to cause improvements in glucose tolerance in previously fasted rats and potentiation of insulin release in response to a glucose challenge. These compounds were unique in not producing hypoglycemia below the normal fasting glycemia levels. Substituent
Beiträge zur Chemie des Bors, 226: Funktionalisierung von Alkinylboranen-Umsetzung mit Nucleophilen
作者:Herta Feulner、Nils Metzler、Heinrich Nöth
DOI:10.1016/0022-328x(94)05147-4
日期:1995.3
The synthesis of alkynylboranes RR′BCCR″ 1–3 and their reactions with various nucleophiles are described (R, R′ = Me2N, Cl, alkyl; R″ = Me, Ph). Although these compounds can be looked upon as inorganic Michael systems, nucleophiles such as alcohols, amines, amides and various carbon nucleophiles attack exclusively at the boron atom (analogous to a 1,2 attack). Thus, a convenient means of functionalization
描述了炔基硼烷RR'BCCR” 1-3的合成及其与各种亲核试剂的反应(R,R'= Me 2 N,Cl,烷基; R” = Me,Ph)。尽管可以将这些化合物视为无机迈克尔系统,但亲核试剂(例如醇,胺,酰胺和各种碳亲核试剂)仅会攻击硼原子(类似于1,2攻击)。因此,描述了在硼原子处炔基硼烷官能化并保留BCC部分的简便方法,并描述了具有R,R'= Me 2 N,N(H)i Pr,pyr,O i Pr的炔基硼烷。中,Me,MES,CCSiMe 3以良好的收率获得和表征通过光谱方法。(Me的反应途径2 N)2 B )CCPh与碳亲核试剂对三(烷基)硼烷的阐明。讨论了对炔基硼烷的电子性质和化学反应性的影响。
Tetrakis-(<i>N</i>-pyrrolyl)methane: Structurally Important Member of the C(NR<sub>2</sub>)<sub>4</sub>Family
作者:Guanxing Sun、Douglas N. Butler、Ronald N. Warrener、Davor Margetić
DOI:10.1002/jhet.2233
日期:2015.7
The structural motif C(NR2)4 is rare in chemistry. The formation, NMR spectroscopic characteristics, and X‐ray structure are reported for a structurally interesting member of this family, namely tetrakis‐(N‐pyrrolyl)methane.
The influence of chiral auxiliaries and catalysts on the selectivity of intramolecular conjugate additions of pyrrole to N-tethered Michael acceptors
作者:Martin G. Banwell、Daniel A. S. Beck、Jason A. Smith
DOI:10.1039/b312552a
日期:——
A series of pyrroles incorporating N-tethered acrylates and related groups has been prepared and examined for their capacity to undergo intramolecular Michael addition reactions to form, in a diastereo- or enantio-selective fashion, the corresponding 8-substituted tetrahydroindolizidine or homologues thereof.
(Tetramethylcyclobutadiene)cobalt Complexes with Five-Electron Carbo- and Heterocyclic Ligands
作者:Elena V. Mutseneck、Dmitry A. Loginov、Dmitry S. Perekalin、Zoya A. Starikova、Denis G. Golovanov、Pavel V. Petrovskii、Piero Zanello、Maddalena Corsini、Franco Laschi、Alexander R. Kudinov
DOI:10.1021/om0495832
日期:2004.12.1
g with NaBH4/AlCl3 or LiAlH4 affords the alkyl derivatives 5b and 5h (R = Et) or the alcohols 5i (R = CH2OH) and 5j (R = CH(OH)Me), respectively. The reaction of 1 with fluorene/AlCl3 yields complex [Cb*Co(η6-fluorene)]+ (8), which was deprotonated by KOBut to give Cb*Co(η6-fluorenyl) (9). Visible light irradiation of 9 induces η6→η5 haptotropic rearrangement to afford Cb*Co(η5-fluorenyl) (7). The pyrrolyl